15 Oct 2013

Damp Proofing Portsmouth

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Damp proofing Portsmouth & Southsea’s Victorian houses.

For years residents of the UK’s only island city have been counting the cost of damp proofing Portsmouth and Southsea’s Victorian houses. Many homes have been treated with high-pressure injection fluids and tanking slurries in the attempt to fight rising damp; but it keeps coming back!

damp proofing portsmouth

Why houses in Portsmouth suffer from so much rising-damp

It is important to remember that much of the city’s old housing is built on reclaimed marshland and mud; as might be well expected due to the proximity of The Solent to the south, Portsmouth harbour to the west and Langstone harbour to the east.

The little Morass in Old Portsmouth and the Great Morass in Southsea were drained and reshaped during the Victorian era. The additional land that was available from the drained area was swallowed up by Victorian houses having shallow foundations constructed with absorbent clay bricks and lime-based mortars. Additionally, the poor quality of the ground in parts resulted in subsidence and structural issues in some properties though retrofit masonry repair and reinforcement works help to stabilise affected housing.

What other factors contribute to damp in old houses?

The Hampshire coast was one of the first areas in the UK to use cavity wall construction as a standard building technique. Most of the housing built in the city after 1870 was constructed with a weather-proofing outer façade that was tied to the main structure of the building with cavity tie irons. Over the years cavities become blocked by mortar droppings and debris. Blocked cavities can bridge the damp course and allow dampness to track from the façade to the inner walls; a mixture of rising and penetrating damp.

Modern Methods of Damp proofing Portsmouth Homes

Considering the typical levels of ground moisture in many areas of the city and the absorbent nature of the Victorian building materials it is little wonder that damp blights so many old houses in Portsmouth. Fortunately PermaFix has the answer. New DPC injection with silicone based emulsion creams are the latest in chemical damp proofing technology. Many are tested and certified for use in old houses by the British Board of Agrement.  PermaFix only use BBA approved damp proofing cream. In addition an air-gap membrane is fitted to the wall prior to renewing the plasterwork. This puts a barrier between the damp-but-drying walls and the plastered finishes of customers’ homes; protecting against risng damp, penetrating damp and the effects of low-level blocked cavities.

PermaFix are experts in Damp proofing Portsmouth and Southsea’s Victorian houses effectively

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